Internal flow numerical simulation of centrifugal pump under gas-liquid two-phase flow
Liu Ruihua1, Li Guidong2, Wang Yang2
1.Jiangsu Electric Power Construction No.3 Engineering Company, China Engineering Group Co. Ltd., Zhenjiang, Jiangsu 212013, China; 2.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract：A centrifugal pump at a specific speed of 129 was chosen to study the internal flow and pressure changes in the running process of centrifugal pumps under gas-liquid two-phase conditions. The unsteady numerical simulation for the full flow field of the pump was processed by the Eulerian-Eulerian inhomogeneous flow model based on CFX simulation software. The pressure pulsation and the volume distribution of the gas phase on the selected monitoring points and surfaces in the volute flow channel under different gas-phase volume fraction conditions were obtained. Comparing the numerical simulation with experimental performance curves, the results show that the gas phase volume is distributed mainly in the ipsilateral direction of impeller front cover in the flow channel of the volute. The monitoring points have the pressure pulsation frequency equivalent to the passing frequency of the blade under different gas contents. With the gas phase volume fraction increasing, the law that the pressure amplitude of monitoring points cyclically changes with time begins to be destroyed, the pressure pulsation frequency domain has a certain disorder and a series of fluctuations appear at low frequency. The fluid pressure of impeller is unevenly distributed due to the inhomogeneous distribution of the gas phase, thus making radial force which the impeller suffered decreased and its periodicity damaged.
刘瑞华, 李贵东, 王洋. 气液两相下离心泵内部流动数值模拟[J]. 排灌机械工程学报, 2015, 33(8): 661-666.
Liu Ruihua, Li Guidong, Wang Yang. Internal flow numerical simulation of centrifugal pump under gas-liquid two-phase flow. Journal of Drainage and Irrigation Machinery Engin, 2015, 33(8): 661-666.
[1]关醒凡. 现代泵理论与设计[M]. 北京:中国宇航出版社,2011.[2]胡四兵,柴立平,何玉杰,等. 离心式气液两相流泵的试验研究[J]. 流体机械,2002,30(2):4-6. Hu Sibing, Chai Liping, He Yujie, et al. Experimental research on the centrifugal pump transferring gas-liquid two phases flow[J]. Fluid Machinery, 2002, 30(2):4-6.(in Chinese)[3]付强,袁寿其,朱荣生,等. 离心泵气液混输瞬态过渡过程水力特性研究[J]. 哈尔滨工程大学学报,2012,33(11):1428-1434. Fu Qiang, Yuan Shouqi, Zhu Rongsheng, et al. Hydraulic characteristics of transient transition process of gas-liquid mixed flow in a centrifugal pump[J]. Journal of Harbin Engineering University, 2012, 33(11):1428-1434.(in Chinese)[4]Feng J, Benra F K, Dohmen H J. Numerical investigation on pressure fluctuations for different configurations of vaned diffuser pumps[J]. International Journal of Rotating Machinery, 2007(7):1-10.[5]Spence R, Amaral J. A CFD parametric study of geometrical variations on the pressure pulsations and performance characteristics of a centrifugal pump[J]. Computers & Fluids, 2009, 38(6):1243-1257.[6]王洋, 代翠. 离心泵内部不稳定流场压力脉动特性分[J]. 农业机械学报, 2010, 41(3):91-95. Wang Yang, Dai Cui. Analysis on pressure fluctuation of unsteady flow in a centrifugal pump[J]. Transactions of the Chinese Society for Agricultural Machinery, 2010, 41(3):91-95.(in Chinese)[7]Tremante A, Moreno N, Rey R, et al. Numerical turbulent simulation of the two-phase flow(liquid/gas)through a cascade of an axial pump[J]. Journal of Flui-ds Engineering, 2002, 124(2):371-376.[8]Jose C, Miguel A, Frank K, et al. Characterization of a centrifugal pump impeller under two-phase flow conditions[J]. Journal of Petroleum Science and Enginee-ring, 2008, 63:18-22.[9]付强,袁寿其,朱荣生,等. 失水事故工况下核主泵气液两相瞬态流动特性[J]. 华中科技大学学报:自然科学版, 2013, 41(9):112-116. Fu Qiang, Yuan Shouqi, Zhu Rongsheng, et al. Transie-nt gas liquid two phase flow characteristics of nuclear main pump under loss of coolant accident[J]. Journal of Huazhong University of Science and Technology:Natural Science Edition, 2013, 41(9):112-116.(in Chinese)[10]Feng J J, Benra F K, Dohmen H J. Investigation of periodically unsteady flow in a radical pump by CFD simulation and LDV measurements[J]. Journal of Turbomachine-ry,2011, 133(1):011004.[11]Lucius A, Brenner G. Numerical simulation and evaluation of velocity fluctuations during rotating stall of a centrifugal pump [J]. Journal of Fluid Engineering,2011,133(8):081102.[12]施卫东,张光建,张德胜,等. 入口非均匀流对轴流泵性能和压力脉动的影响[J]. 排灌机械工程学报, 2014,32(4):277-282. Shi Weidong, Zhang Guangjian, Zhang Desheng, et al. Effects of non-uniform suction flow on performance and pressure fluctuation in axial-flow pumps[J]. Journal of Drainage and Irrigation Machinery Engineering, 2014,32(4):277-282.(in Chinese)[13]余志毅,刘影. 叶片式混输泵气液两相非定常流动特性分析[J]. 农业机械学报,2013,44(5):66-69. Yu Zhiyi, Liu Ying. Characteristic analysis of unsteady gas-liquid two-phase flow in a multiphase rotodynamic pump[J]. Transactions of the Chinese Society for Agricultural Machinery, 2013, 44(5):66-69.(in Chinese)[14]付强,王秀礼,袁寿其,等. 气液条件下导叶出口位置对反应堆冷却剂主泵性能的影响[J]. 核动力工程, 2013, 34(6):111-114. Fu Qiang, Wang Xiuli, Yuan Shouqi, et al. Effect of guide vane outlet position on nuclear reactor coolant pump under gas-liquid two-phase condition[J]. Nuclear Power Engineering, 2013, 34(6):111-114.(in Chinese)[15]卢金铃, 席光, 祁大同. 离心泵叶轮内气液两相三维流动数值研究[J]. 工程热物理学报, 2003(2):237-240. Lu Jinling, Xi Guang, Qi Datong. Numerical study on the gas liquid two phase 3D flow in the impeller of a centrifugal pump[J]. Journal of Engineering Thermophysics, 2003(2):237-240.(in Chinese)[16]朱荣生, 郑宝义, 袁寿其,等. 1 000 MW核主泵失水事故工况下气液两相流分析[J]. 原子能科学技术, 2012, 46(10):1202-1206. Zhu Rongsheng, Zhen Baoyi, Yuan Shouqi, et al. 1 000 MW nuclear main pump gas-liquid two-phase flow analysis under loss of coolant accident[J]. Atomic Energy Science and Technology, 2012, 46(10):1202-1206.(in Chinese)[17]Shi F, Tsukamoto H. Numerical study of pressure fluctuations caused by impeller-diffuser interaction in a diffuser pump stage[J].Journal of Fluids Engineering,2001,123(3):466-474.
